Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Narrative) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($) plan	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Concentration Risk	10.00%
Change in Plan Assets
non-current pension liability	$ 3,187,357	$ 3,638,295
Current pension liability	62,513	57,994
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 4,707,433	4,827,966
Change in Plan Assets
Number of qualified pension plans \| plan	9
Mandatory employee contribution under Retirement Plan III	3.00%
Mandatory contribution plan participation period	10 years
Accumulated pension benefit obligation	$ 6,300,000	6,600,000
Net periodic benefit costs	321,138	216,477	$ 352,125
Amortization of prior credit	1,561	1,600	2,125
Expected Employer Contributions	$ 387,500
Number of Final Average Pay Qualified Pension Plans in which Assets Held in Master Trust	7
Number of Qualified Pension Plans in which Registrant Subsidiaries Participate	4
Number of Cash Balance Pension Plans in which Asset Held in Second Master Trust	2
Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 4,707,433	4,827,966	4,429,237
Change in Plan Assets
Projected benefit obligation	6,848,238	7,230,542	5,770,999
non-current pension liability	2,140,805	2,402,576
Accumulated other comprehensive income (before taxes)	640,256	672,697
Other Postretirement Benefits [Member]
Change in Plan Assets
Expected Employer Contributions	52,600
Non-Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	137,600	130,600
Net periodic benefit costs	22,800	32,400	54,500
Settlement charges related to the payment of lump sum benefits out of the plan	5,100	15,100	33,000
Projected benefit obligation	157,300	151,800
non-current pension liability	136,100	135,600
Current pension liability	21,200	16,200
Amortization of prior credit	58,800	60,300
Accumulated other comprehensive income (before taxes)	23,500	23,500
Defined Contribution Plans [Member]
Change in Plan Assets
Subsidiaries' contribution to defined contribution plan	$ 44,400	43,300	44,500
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Entergy Arkansas [Member]
Change in Plan Assets
non-current pension liability	$ 459,153	571,870
Entergy Arkansas [Member] \| Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	1,309,903	1,379,108
Net periodic benefit costs	62,683	42,365	69,013
Amortization of prior credit		0	23
Entergy Arkansas [Member] \| Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	959,618	977,521	896,295
Change in Plan Assets
Projected benefit obligation	1,400,511	1,485,718	1,192,640
non-current pension liability	440,893	508,197
Entergy Arkansas [Member] \| Non-Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	4,495	4,086
Net periodic benefit costs	446	754	448
Projected benefit obligation	4,694	4,495
non-current pension liability	2,566	4,148
Current pension liability	2,128	347
Accumulated other comprehensive income (before taxes)	0	0
Settlement charges		337
Entergy Louisiana [Member]
Change in Plan Assets
non-current pension liability	833,185	931,988
Entergy Louisiana [Member] \| Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	1,436,535	1,523,691
Net periodic benefit costs	72,860	49,390	80,329
Amortization of prior credit		0	92
Entergy Louisiana [Member] \| Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1,071,234	1,113,359	1,031,187
Change in Plan Assets
Projected benefit obligation	1,564,710	1,666,535	1,341,212
non-current pension liability	493,476	553,176
Entergy Louisiana [Member] \| Non-Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	2,538	2,824
Net periodic benefit costs	377	135	163
Projected benefit obligation	2,550	2,851
non-current pension liability	2,313	2,592
Current pension liability	237	259
Accumulated other comprehensive income (before taxes)	41	98
Settlement charges	108
Entergy Mississippi [Member]
Change in Plan Assets
non-current pension liability	120,217	135,156
Entergy Mississippi [Member] \| Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	379,775	399,300
Net periodic benefit costs	16,412	9,988	16,283
Amortization of prior credit		0	10
Entergy Mississippi [Member] \| Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	292,297	301,250	281,837
Change in Plan Assets
Projected benefit obligation	408,604	432,169	345,824
non-current pension liability	116,307	130,919
Entergy Mississippi [Member] \| Non-Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	1,802	1,761
Net periodic benefit costs	235	190	192
Projected benefit obligation	2,185	2,128
non-current pension liability	2,066	2,009
Current pension liability	119	119
Accumulated other comprehensive income (before taxes)	0	0
Settlement charges	2
Entergy New Orleans [Member]
Change in Plan Assets
non-current pension liability	43,609	62,440
Entergy New Orleans [Member] \| Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	176,692	186,473
Net periodic benefit costs	8,981	6,607	10,413
Amortization of prior credit		0	2
Entergy New Orleans [Member] \| Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	129,975	133,344	122,960
Change in Plan Assets
Projected benefit obligation	191,064	202,555	163,707
non-current pension liability	61,089	69,211
Entergy New Orleans [Member] \| Non-Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	417	436
Net periodic benefit costs	64	95	92
Projected benefit obligation	468	476
non-current pension liability	449	453
Current pension liability	19	23
Accumulated other comprehensive income (before taxes)	0	0
Entergy Texas [Member]
Change in Plan Assets
non-current pension liability	77,517	111,011
Entergy Texas [Member] \| Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	359,687	391,296
Net periodic benefit costs	12,059	8,521	16,223
Amortization of prior credit		0	6
Entergy Texas [Member] \| Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	298,378	310,713	295,751
Change in Plan Assets
Projected benefit obligation	383,627	418,498	356,080
non-current pension liability	85,249	107,785
Entergy Texas [Member] \| Non-Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	8,460	9,215
Net periodic benefit costs	595	491	1,001
Projected benefit obligation	8,832	9,567
non-current pension liability	8,059	8,814
Current pension liability	773	753
Accumulated other comprehensive income (before taxes)	0	0
Settlement charges		16	415
System Energy [Member]
Change in Plan Assets
non-current pension liability	112,264	129,152
System Energy [Member] \| Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	286,917	305,556
Net periodic benefit costs	16,581	12,229	13,702
Amortization of prior credit		2	9
System Energy [Member] \| Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	212,006	217,621	196,328
Change in Plan Assets
Projected benefit obligation	311,542	334,312	$ 270,789
non-current pension liability	$ 99,536	$ 116,691
Minimum [Member] \| Qualified Pension Plans [Member]
Change in Plan Assets
Voluntary employee contributions under Retirement Plan III	1.00%
Minimum [Member] \| Defined Contribution Plans [Member]
Change in Plan Assets
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	70.00%
Maximum [Member] \| Qualified Pension Plans [Member]
Change in Plan Assets
Voluntary employee contributions under Retirement Plan III	10.00%
Maximum [Member] \| Defined Contribution Plans [Member]
Change in Plan Assets
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Domestic Equity Securities [Member] \| Non-Taxables [Member]
Change in Plan Assets
Target asset allocation	39.00%
Domestic Equity Securities [Member] \| Qualified Pension And Other Postretirement Plans [Member]
Change in Plan Assets
Target asset allocation	45.00%
International Equity Securities [Member] \| Non-Taxables [Member]
Change in Plan Assets
Target asset allocation	26.00%
International Equity Securities [Member] \| Qualified Pension And Other Postretirement Plans [Member]
Change in Plan Assets
Target asset allocation	20.00%
Fixed Income Securities [Member] \| Non-Taxables [Member]
Change in Plan Assets
Target asset allocation	35.00%
Fixed Income Securities [Member] \| Qualified Pension And Other Postretirement Plans [Member]
Change in Plan Assets
Target asset allocation	35.00%

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Number of Qualified Pension Plans in which Registrant Subsidiaries Participate

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Settlement Charge Associated With Out Of Plan Payment Of Lump Sum Benefits

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Voluntary Employee Contributions Contribution Under Retirement Plan

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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The amount of the cost recognized during the period for defined contribution plans.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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